um, herkomer is the man responsible for leading that movement. we look under here, these lovely big fat fleshy leaves which are beautifully carved-- look at the kick in that scroll. and then when you come down here, you've got this sort of tudoresque style with the finest possible little flowers. and each of those panels is different. i mean, they're absolutely charming. somebody might have suggested, because this is black glass, that it might be for looking at eclipses. but in fact it's a claude glass, named after claude lorrain, the artist. okay? and it is for an artist to hold up to create to the view of his picture. it's an illusionary thing. - gosh. - and if you look in here, - can you see-- - yes. now can you see the background? can you see the trees? - yes. - right. now there's a perfect oil painting. and that's what he would have in his mind to paint. it clarified the vision. fabulously interesting! beautiful object! just wonderful. - woman: yes. - there. there it is-- - mystery object solved. - wonderful. now valuewise-- very difficult.